Ammonia sensor

Abstract

A gas sensor, particularly an ammonia sensor, having a first sensor cell that is made up of a solid electrolyte, a first measuring electrode that is to be exposed to the measuring gas and a second measuring electrode. In order to reduce an NO x cross-sensitivity of the sensor, it is distinguished by the first measuring electrode being covered by a catalytic converter for the chemical conversion of nitrogen oxides.

1 - 10 . (canceled) 
   
   
       11 . A gas sensor, comprising:
 a first measuring electrode, which is to be exposed to a measuring gas;   a second measuring electrode; and   a first sensor cell including a solid electrolyte;   wherein the first measuring electrode is covered by a catalytic converter for chemically converting nitrogen oxides.   
   
   
       12 . The gas sensor of  claim 11 , wherein the catalytic converter is catalytically effective with respect to a chemical reaction between nitrogen oxides, including at least one of NO, NO 2  and ammonia (NH 3 ). 
   
   
       13 . The gas sensor of  claim 11 , wherein the catalytic converter has components of at least one of titanium dioxide (TiO 2 ) and vanadium pentoxide (V 2 O 5 ). 
   
   
       14 . The gas sensor of  claim 11 , wherein the catalytic converter has components of zeolite. 
   
   
       15 . The gas sensor of  claim 11 , wherein an electrically insulating layer is developed between the first measuring electrode and the catalytic converter. 
   
   
       16 . The gas sensor of  claim 11 , wherein the measuring electrode is constructed of at least one of a metal and a metal oxide. 
   
   
       17 . The gas sensor of  claim 11 , wherein the second measuring electrode is situated so that it is exposed to the measuring gas. 
   
   
       18 . The gas sensor of  claim 11 , wherein the second measuring electrode is covered by a catalytic converter. 
   
   
       19 . The gas sensor of  claim 11 , wherein the second measuring electrode is covered by an oxidation catalytic converter. 
   
   
       20 . The gas sensor of  claim 11 , further comprising:
 a third electrode provided in a reference air channel.